Crest 3D White Professional Effects Whitestrips with Advanced Seal

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The overall winner in our tooth whitener test, Crest 3D White Professional Effects Whitestrips with Advanced Seal easily outperformed the competition. Consumer testers who were willing to put in the time (30-minute sessions over 20 days), saw teeth get two to four shades lighter — and some consumers even noticed a difference after a mere four days of use. The strips' easy application and strong bond to teeth meant little formula spilled over or seeped on to gums and testers loved that they could "still do other things around the house while whitening." Volunteers did complain of some tooth sensitivity, but that wasn't uncommon among tooth whiteners tested.